Cutter-cylinder



J. BOYLE.

PatentedOot. 15, 1895.

with my invention.

' Uhuru *raras JOHN BOYLE, OF PEABODY, MASSACHUSETTS.`

CUTTER-CYLINDER.

SPECIFICATION forming part of Letters Patent No. 547,984, dated October 15, 1895.

Application iiled .T uly 20, 1895.

T all whom it may concern:

Be it known that l, JOHN BOYLE, of Peabody, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Cutter-Cylinders, of which the following is a specification.

This invention has relation to cutter-cylinders employed in leather-dressing machines, by means of which the particles of iiesh which adhere to the hide are thoroughly removed therefrom. The cuttercylinders heretofore employed for this purpose were provided with cutting-knives extending in pairs from the middle of the cylinder upon which they were mounted in opposite helices to the ends thereof and retreating from the direction of revolution. This arrangement of the knives was objectionable in that they met at the middle of the cylinder in an obtuse angle, which progressed in the direction of the revolution and scraped and cut into the skin and damaged it, leaving a more or less well-defined cut or depressed part, besides puncturing the skin and injuring its quality by leaving the fiber exposed.

The object of my invention is to provide the tieshing-cylinder with means whereby these objections may be obviated, so that when the hide has been treated by the roll it will present an unwrinkled, unscarred appearance.

Reference is to be had to the accompanying drawings and to the letters marked thereon, forming a part of this specification, similar letters indicating similar parts or features, as the case may be, wherever they occur.

Figure l of the drawings shows in perspective a deshing-roll constructed in accordance Fig. 2 shows in detail the preferred arrangement of the knives. Fig. 3 is a similar view of a slightly modified arrangement of knives.

The cylinder a is of the usualsort, mounted, as desired, upon a supporting and driving shaft b. Upon the cylinder are secured a series of helically-arranged knives c c', which meet at an angle d at or near the center of the cylinder, each pair of knives extending therefrom rearwardly around the cylinder to the opposite ends thereof. They may be secured in place in any preferred way. In order to prevent the angles from digging and cut- Serial No. 556,634. (No model.)

ting into the skin as they advance in the direction of revolution, I employ guard-knives', which extend peripherally around the cylinder. In Figs. l and 2 I have illustrated the preferred arrangement of knives, they being in this case straight knife-edges e, placed parallel to one knife c of a pair which meet at an angle d and intersecting the other knife c of the pairA at a point more' or less remote from the angle. By this means I provide a guard which extends across the circumferential line h, that passes through the vertices of the angles d and prevents the said angles from digging into the skin. Preferably the guard-knives e are staggered--that is to say,

they are arranged so as to extend alternately in opposite directions, one knife being parallel to knife c and intersecting knife c at c2, and the next knife e being parallel to knife c and intersecting knife c at c2. In this case the knives c and cv are alternately extended beyond the angle, as at c3, to intersect the guard-knife at its end at an angle c4.

While the arrangement described above is that which I prefer, yet, if desired, I may employ guard-knives such as illustrated in Fig. 3. Instead of extending one of each pair of knives c c beyond the angle d, I may f orm angular guard-knivesf, each of which is so placed and mounted upon the cylinder as to leave a short edge f intersecting one angle d and forming, practically, a continuation of one knife c or c and having a long edgef2 arranged parallel to the next knife c or c', but intersecting the next knife c or cthat is to say, the guard-knives are each bent into an angle and are arranged alternately with their angles pointing toward opposite ends of the cylinder.

It will be seen from the drawings that when the cylinder has received its complement of' cutters it presents, practically, the same appearance when the angular guardknives are employed as when the straight guard-knives are used in connection withthe extended helical knives c c', and that the results accomplished by them are practically the same.

The gnardknives, by their extending across the line of the angles cl, being rst inclined in the direction of revolution toward one end of the cylinder and then toward the other end, eectively remove all flesh from the skin and at the same time prevent the angles d from cutting into the skin, puckering it, or forming a more or less scarred or burnished path across it.

Having thus explained the nature of my invention and described a Way of constructing and using the same, though Without attempting to set forth all of the forms in which it may be made or all of the modes of its use, what I claim, and desire to secure by Letters Patent, is-

A cutter cylinder, of the character described, having the usual double helical series of knives, and guard knives extending around the cylinder, each guard knife arranged to lie in the space between the helical knives to intersectaline passing through thc vertices of the angles thereof, and to also meet the adjacent helical knife at a point a slight distance from its angle, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 17th day of July, A. D. 1895.

JOHN BOYLE.

Witnesses:

A. D. HARRISON, W. P. ABnLL. 

